Editing Metal casting (section)

===Evaporative-pattern casting===
{{Main article|Evaporative-pattern casting}}

This is a class of casting processes that use pattern materials that evaporate during the pour, which means there is no need to remove the pattern material from the mold before casting. The two main processes are lost-foam casting and full-mold casting.

====Lost-foam casting====
{{Main article|Lost-foam casting}}

Lost-foam casting is a type of evaporative-pattern casting process that is similar to investment casting except foam is used for the pattern instead of wax. This process takes advantage of the low [[boiling point]] of foam to simplify the investment casting process by removing the need to melt the wax out of the mold.

====Full-mold casting====
{{Main article|Full-mold casting}}

Full-mold casting is an evaporative-pattern casting process which is a combination of sand casting and [[lost-foam casting]]. It uses an [[expanded polystyrene]] foam pattern which is then surrounded by sand, much like sand casting. The metal is then poured directly into the mold, which vaporizes the foam upon contact.